DVD disc, device and method for reproducing the same

ABSTRACT

A disc for recording audio data of multi-channels while being reciprocally used with a device for reproducing a DVD-video disc. The device for reproducing a DVD audio disc includes a video attribute of a video title set including an extended audio data mode; a sub-picture attribute thereof including the extended audio data mode; video/sub-picture packs including an extended audio stream, the extended audio stream being having an extended audio stream header and frames, the extended audio stream header having a usage area for storing an audio coding mode, sampling frequency, quantization bit number, and usage data of extended audio data, and the usage area of the extended audio data indicating bit extension, bandwidth extension, and channel extension of the extended audio data, whereby the video/sub-picture packs are made as an audio pack for selectively recording the extended audio data when recording and the audio data can be reproduced by combining reproducing data of a basic audio pack with the extended audio pack when reproducing the data from the disc.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a DVD disc, a device and a method forreproducing the same and more particularly, to an audio private DVDdisc, a device and a method for reproducing the same.

2. Description of the Related Art

A digital versatile disc (hereinafter, referred to as DVD)-video disc isdivided into a video data area, a sub-picture data area, a navigationdata area, and an audio data area, and the whole capacity thereof is4.7/8.5 Gbyte and the transmission speed is 10.08 Mbps. DVDspecification allows a maximum 9 Mbps for a video stream, a maximum of 6Mbps for an audio stream and a maximum of 6 Mbps for a sub-picturestream. However, the sum of all these streams should not exceed 10.08Mbps, the maximum transmission speed of the entire DVD system. The datacompressed with an MPEG-1/MPEG-2 video system is stored at the videoarea of the DVD-video disc and at maximum, eight audio data streams arestored in the audio data area thereof using linear PCM (pulse codemodulation), AC-3, MPEG-2, DTS, and SDDS systems. A device forreproducing the DVD-video disc decodes the video data recorded on theDVD-video disc, restores the decoded data as the moving picture,converts the restored moving picture into analog screen information, andoutputs the converted information. Also, the aforesaid device decodesthe audio data and converts the decoded audio data into an analog audiosignal, thereby outputting the converted signal.

The audio data recorded at the DVD-video disc as described above canprovide the best sound quality in case of using the linear PCM system.However, in case of using the linear PCM system, two channels can beserviced in the audio data which is quantized at the sampling frequencyof 96 KHz by 24 bits, eight channels can be serviced in the audio datawhich is quantized at the sampling frequency of 48 KHz by 16 bits, andchannels or sampling frequencies exceeding the number of the abovechannels and the sampling frequencies can not be used. That is, sincethe DVD-video disc and the device for reproducing the same shouldprocess the video data at the maximum of 9 Mbps and the audio data atthe maximum of 6 Mbps at the same time, there is a problem in that it isdifficult to provide a high sound quality with multi-channels.

Coping with the foregoing problems, there have been suggested methodsfor improving the audio quality by using a system which is not used inthe DVD-video disc. However, the methods cannot be reciprocally usedwith the DVD-video disc, so that the information efficiency may belowered, thereby having a difficulty in providing the audio data of themulti-channels.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a disc for recordingaudio data of multi-channels which may be used reciprocally in a devicefor reproducing data from a DVD-video disc.

Another object of the present invention is to provide a DVD-audio discwhich extends and stores the audio data at an area where non-audio datais normally stored, such as in a video area and a sub-picture area inthe DVD video disc.

Still another object of the present invention is to provide a device forreproducing audio data in the DVD audio disc included with an audio dataarea, a video data area, a sub-picture area, other data areas, the areasother than the audio data area storing extended audio data.

Yet another object of the present invention is to provide a method forreproducing audio data in the DVD-audio disc included with an audio dataarea, a video area, a sub-picture area, and other data areas for storingextended audio data.

In order to accomplish the objects of the present invention, there isprovided a DVD audio disc, including a DVD video area including a videomanagement information area and a plurality of video title set areas;the video title set area including areas for storing video title setinformation, a video object set menu, and a plurality of video objectset titles; the video title set information area including the videotitle set information management table; the video title set informationmanagement table area including a video title set video attribute havinga video compression mode area for indicating an MPEG video compressionmode and an extended audio data mode, a video title set sub-pictureattribute having a sub-picture coding mode area for indicating asub-picture mode and the extended audio data mode, and a video title setaudio attribute including an audio coding mode area; video object setsof the video title set title including a plurality of video packs,sub-picture packs and audio packs, the packs having a plurality offrames in which a header and real data are recorded; the video streamand sub-picture stream including an extended audio header having achannel number, a sampling frequency, and a plurality of the channelheaders corresponding to the channel number; the channel headersincluding an area for storing the channel number of the correspondingchannel, a coding mode of the extended audio data, usage of the extendedaudio data, a quantization bit number of the extended audio data, and asampling frequency of the extended audio data; and the usage area of theextended audio data indicative of corresponding extension usage such asbit extension, bandwidth extension, and channel extension, whereby thevideo stream and the sub-picture stream of the DVD area can bereproduced.

Further, the present invention is provided with a device for reproducinga DVD audio disc, comprising a basic audio decoder; an extended audiodecoder; and an extender, whereby the basic audio decoder reproducesdata of an audio pack, the extended audio decoder reproduces theextended audio data and the extender combines the extended audio datawith basic audio data, thereby performing bit extension, bandwidthextension, and channel extension of the audio data and outputs thecombined audio data.

Furthermore, the present invention provides a method for reproducingdata from a DVD audio disc, including the steps of analyzing video andsub-picture attributes of the video title set to be reproduced; enablinga basic audio decoder and an extended audio decoder in an extended audiomode; checking usage of the extended audio data included in channelheaders of the corresponding video title set; and combining the extendedaudio data decoded at the extended audio decoder, at the basic audiodecoder to be output.

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete appreciation of this invention, and many of theattendant advantages thereof, will be readily apparent as the samebecomes better understood by reference to the following detaileddescription when considered in conjunction with the accompanyingdrawings, in which like reference symbols indicate the same or similarcomponents, wherein:

FIG. 1 shows the volume structure of a DVD disc according to anembodiment of the present invention;

FIG. 2 shows the structures of VMG and VTS in FIG. 1;

FIG. 3 shows the structure of VTSI in FIG. 2;

FIG. 4 shows the structure of VTS₋₋ MAT in FIG. 3;

FIG. 5 shows the structure of VTS₋₋ AST₋₋ ATR in FIG. 4 according to theembodiment of the present invention;

FIG. 6A shows the structure of VTS₋₋ V₋₋ ATR according to the embodimentof the present invention;

FIG. 6B shows the structure of VTS₋₋ SPST₋₋ ATR according to theembodiment of the present invention;

FIG. 7 shows the directory structure in case that an audio title of abasic audio area and an audio title of an extended audio area areseparately provided according to the embodiment of the presentinvention, and the structure of VTSI;

FIG. 8A shows the relation between VOBU and a video pack according tothe embodiment of the present invention;

FIG. 8B shows the relation between a header of a sub-picture unit and asub-picture pack;

FIG. 9 shows the structure of the extended audio streams for recordingthe extended audio data according to the embodiment of the presentinvention;

FIGS. 10A to 10C show examples of the structure of the physical data ofthe extended audio stream, wherein FIG. 10A is a diagram illustratingthe format that the extended audio stream is recorded at the video areaand the sub-picture area, FIG. 10B is a diagram illustrating the formatthat the extended audio stream is recorded at the video area, and FIG.10C is a diagram illustrating the format that the extended audio streamis recorded at the sub-picture area, according to the embodiment of thepresent invention;

FIG. 11 shows the method for combining the basic area data and theextended area data in the audio decoder and increasing the number ofbits according to the embodiment of the present invention;

FIG. 12A shows the method for at the audio decoder, frequency-convertingthe basic area data at the audio decoder, combining thefrequency-converted data with high-pass of the extended area, andextending the bandpass according to the embodiment of the presentinvention;

FIG. 12B shows the method for combining the basic area data and theextended area data expressed as 2-bands at the audio decoder andextending the bandpass according to the embodiment of the presentinvention;

FIGS. 13A and 13B show the reproducing examples of the case that theeffect channel is recorded at the extended area, wherein FIG. 13A is theprocess of separating an original basic signal by using the basicchannel and the extended channel, and FIG. 13B is the process ofintactly reproducing the basic channel and the extended channel,according to the embodiment of the present invention;

FIG. 14 shows the structure of privately reproducing only a DVD-audiodisc without expression of moving picture according to the embodiment ofthe present invention;

FIG. 15 shows the structure of the audio decoder for decoding the audiodata recorded at the disc in the DVD audio private reproducing device ofFIG. 14;

FIG. 16 is a flow chart illustrating the process of initializing theaudio decoder to reproduce the title in the DVD-audio privatereproducing device having the same structure as that of FIG. 14;

FIGS. 17A, 17B, and 17C are flow charts illustrating the processes ofthe extended audio decoder and the bandpass extender in the DVD-audioreproducing device, according to the embodiment of the presentinvention;

FIG. 18 shows the structure of a device for commonly reproducing boththe DVD-video disc and the DVD-audio disc according to the embodiment ofthe present invention;

FIG. 19 shows the structure of the combined video/audio decoder in thereproducing device having the same structure as that of FIG. 18; and

FIG. 20 is a flow chart illustrating the process of initializing thecombined audio decoder for reproducing the title in the combinedreproducing device as shown in FIG. 18.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

A disc according to an embodiment of the present invention records basicaudio data in the audio data area of a DVD-video title set, and extendedaudio data capable of embodying the high sound quality is recorded inthe video data area, the sub-picture area, and other private streamareas.

Logic data structure of the DVD-video disc includes the structure ofvolume space, the structure of a video manager (hereinafter, referred toas VMG), the structure of a video title set (hereinafter, referred to asVTS), and the structure of video object set (hereinafter, referred to asVOBS). FIG. 1 shows the volume structure of the DVD video disc accordingto the embodiment of the present invention.

With reference to FIG. 1, the volume space of the DVD video disc furthercomprises a volume and file structure, a single DVD-video zone andDVD-others zone. One VMG and VTSs existing at a range from at least 1 toa maximum of 99 can be assigned to the DVD-video zone where the datastructure of the DVD-video is assigned. The VMG is arranged at the frontof the DVD-video zone and has two or three files. Also, each of the VTSsincludes files numbering in a range from at least 3 to a maximum of 12.

FIG. 2 shows the structures of the VMG and VTS in FIG. 1, where all ofVOBs (video objects) are recorded at contiguous blocks. The VOB iscomprised of data such as the video data, the sub-picture data, and theaudio data.

Referring to FIG. 2, the VMG has a video manager information(hereinafter, referred to as VMGI) file as the control data, a menu fileof VOBs (VMGM₋₋ VOBS), and a VMGI backup file. In addition, each of then VTSs is constructed with video title set information (VTSI) as thecontrol data, a menu of the VOBs (VTSM₋₋ VOBS), a title of the VOBs(VTSTT₋₋ VOBS), and backup files of the VTSI. Further, the VTSTT₋₋ VOBSincludes a plurality of C₋₋ IDNs. Herein, C₋₋ IDN# indicates the cell IDnumber within the VOB and VOB₋₋ IDN# indicates the VOB ID number withinthe VOBs.

FIG. 3 shows the structure of the VTSI in FIG. 2, where the VTSI ispositioned at the front of each VTS. As shown in FIG. 3, the VTSI hasinformation of one or more than one video titles and a video title setmenu VTSM. The VTSI includes the management information of each title.Here, the title management information has the information of seekingthe PTT(Part₋₋ of₋₋ Title), the VTSM information, and the informationfor reproducing the VOBs, and the information for attributes of VOBs.

As illustrated in FIG. 3, the video title set information VTSI includesa video title set information management table (VTSI₋₋ MAT), a videotitle set part₋₋ of₋₋ title search pointer table (VTS₋₋ PTT₋₋ SRPT), avideo title set program chain information table (VTS₋₋ PGCIT), a videotitle set menu PGCI unit table (VTSM₋₋ GCI₋₋ UT), a video title set timemap table (VTS₋₋ TMAPT), a video title set menu cell address table(VTSM₋₋ C₋₋ ADT), a video title set menu video object unit address map(VTSM₋₋ VOBU₋₋ ADAMP), a video title set cell address table (VTS₋₋ C₋₋ADT), and a video title set video object unit address map (VTS₋₋ VOBU₋₋ADMAP).

FIG. 4 shows the structure of VTSI₋₋ MAT of the DVD-video in FIG. 3,wherein the VTSI₋₋ MAT is indicative of each item of information of theVTSI and the start address of the attribute of the VOBS within the VTS.

With respect to FIG. 4, the audio stream attribute table of the VTS(VTS₋₋ AST₋₋ ATRT) of RBP 516 to 579 in the VTSI₋₋ MAT having the samestructure as that of FIG. 4, stores VTS₋₋ AST₋₋ ATR #0-#7 RBPs of theeight audio streams, each of the VTS₋₋ AST₋₋ ATRs having 8 bytes asshown in FIG. 5, and the respective field's values become the internalinformation of the audio stream of the VTSM₋₋ VOBS.

When observing the structure of the VTS₋₋ AST₋₋ ATR with reference toFIG. 5, the information of the audio coding mode recorded firstly inb63-b61 is given as in the following table 1.

                  TABLE 1                                                         ______________________________________                                        b63-b61                                                                              Audio Coding Mode                                                      ______________________________________                                        000b   Dolby AC-3                                                             010b   MPEG-1 or MPEG-2 where no extension bit stream exists                  011b   MPEG-1 where extension bit stream exists                               100b   Linear PCM Audio                                                       110b   DTS (option)                                                           111b   SDDS (option)                                                          others Reserved                                                               ______________________________________                                    

The multichannel extension of b60 is an area which stores informationindicative of whether the multichannel extension is executed or not. If0b is recorded, this means that the multichannel extension is notselected. However, if 1b is recorded, this means that the multichannelextension is performed according to the information of VTS₋₋ MU₋₋ AST₋₋ATRT recorded on RBP 792-983 of the VTSI₋₋ MAT as depicted in FIG. 6B.

The audio type of b59-b58 is shown as in the following table 2.

                  TABLE 2                                                         ______________________________________                                        b59-b58           Audio Type                                                  ______________________________________                                        00b               Not Specified                                               01b               Language Included                                           others            Reserved                                                    ______________________________________                                    

The audio application mode of b57-56 is shown as in the following table3.

                  TABLE 3                                                         ______________________________________                                        b57-b56          Audio Application Mode                                       ______________________________________                                        00b              Not Specified                                                01b              Karaoke Mode                                                 10b              Surround Mode                                                11b              Reserved                                                     ______________________________________                                    

In b55-b54, quantization/DRC information is stored as follows. If theaudio coding mode is "000b", 11b is recorded. If the audio coding modeis 010b or 011b, the quantization information is defined as follows.

00b: the dynamic range control data is not present in the MPEG audiostream.

01b: the dynamic range control data is present in the MPEG audio stream.

10b: reserved

11b: reserved

If the audio coding mode is 100b, the quantization information is storedas shown in the following table 4.

                  TABLE 4                                                         ______________________________________                                        b55-b54           Quantization DRC                                            ______________________________________                                        00b               16bits                                                      01b               20bits                                                      10b               24bits                                                      11b               Reserved                                                    ______________________________________                                    

b53-b52, indicative of sampling frequency fs in FIG. 1, is shown as inthe following table 5.

                  TABLE 5                                                         ______________________________________                                                b53-b52      fs                                                       ______________________________________                                                00b          48KHz                                                            01b          96KHz                                                            10b          Reserved                                                         11b          Reserved                                                 ______________________________________                                    

b50-b48 indicative of the number of audio channels in FIG. 1 is shown asin the following table 6.

                  TABLE 6                                                         ______________________________________                                        b50-b48         Number of Audio Channels                                      ______________________________________                                        000b            1ch (mono)                                                    001b            2ch (stereo)                                                  010b            3ch (multichannel)                                            011b            4ch (multichannel)                                            100b            5ch (multichannel)                                            101b            6ch (multichannel)                                            110b            7ch (multichannel)                                            111b            8ch (multichannel)                                            others          Reserved                                                      ______________________________________                                    

Further, VTS₋₋ MU₋₋ ATRT (multichannel audio stream attribute table ofVTS) of RBP 792-983 in the VTSI₋₋ MAT as shown in FIG. 4 stores VTS₋₋MU₋₋ AST₋₋ ATR #0-#7 RBPs of eight audio streams. Furthermore, each ofVTS₋₋ MU₋₋ AST₋₋ ATR is comprised of VTS₋₋ MU₋₋ AST₋₋ ATR(1) of 8 bytesand VTS₋₋ MU₋₋ AST₋₋ ATR(2) of 16 bytes.

The DVD-video disc as described previously records the correspondingdata respectively, in the video area, the sub-picture area, and theaudio area of the video title set. In this case, the audio data havinggood quality necessary for the high sampling frequency and themultichannel can be not recorded. Accordingly, the disc according to theembodiment of the present invention records the basic audio data in theaudio area of the DVD-video title set, and the extended audio data forembodying the high sound quality by being added to the basic data, isrecorded at other video, sub-picture, and private stream areas.

As a result, in the event of recording the audio data in the video area,there are various methods of using a reserved code not to generate thedecoding upon the video stream which are applied to the video decoder orof designating the screen size of the size (0*0) that has no standard.Additionally, when recording the audio data at the sub-picture area,there are various methods of using the reserved coding mode not togenerate the decoding when the sub-picture stream is recorded at thesub-picture decoder.

FIG. 6A shows the structure of VTS₋₋ V₋₋ ATR according to the embodimentof the present invention, which is recorded at the RBP 512-RBP 513 ofthe VTSI₋₋ MAT of FIG. 4 in the DVD-audio disc. Then, VTS₋₋ V₋₋ ATR isrepresented as the video attribute or the extended audio attribute ofthe VTSTT₋₋ VOBS within the VTS, and the information of the streamwithin the VTSTT₋₋ VOBS is as follows.

Most of all, b15-b14 indicative of the video compression mode and theextended audio mode is given as in the following table 7.

                  TABLE 7                                                         ______________________________________                                        b15-b14          video compression mode                                       ______________________________________                                        00               complies with MPEG-1                                         01               complies with MPEG-2                                         11               extended audio data                                          others           Reserved                                                     ______________________________________                                    

As depicted in the foregoing table 7, when the extended audio data isrecorded at the video stream, 11 is recorded as the video compressionmode. Otherwise, mode values corresponding to the really-used videocompression mode is recorded.

b13-b12 of the TV system is given as in the following table 8.

                  TABLE 8                                                         ______________________________________                                                b13-b12      TV system                                                ______________________________________                                                00           525/60                                                           01           625/50                                                           others       reserved                                                 ______________________________________                                    

b11-b10 of the aspect ratio is given as in the following table 9.

                  TABLE 9                                                         ______________________________________                                               b11-b10      aspect ratio                                              ______________________________________                                               00           4:3                                                              11           16:9                                                             others       reserved                                                  ______________________________________                                    

b9-b8 of the display mode indicate whether or not the display mode for a4:3 monitor is acknowledged. As stored in the above table 9, when theaspect ratio is "00" (4:3), "11" is recorded. Or, when the aspect ratiois "11" (16:9), "00", "01" or "10" is recorded. The value of the displaymode is given as in the following table 10.

                  TABLE 10                                                        ______________________________________                                        b9-b8           display mode                                                  ______________________________________                                        00              both Pan-scan and letterbox                                   01              only Pan-scan                                                 10              only letterbox                                                11              reserved                                                      ______________________________________                                    

b7 of line21₋₋ switch₋₋ 1 is given as in the following table 11.

                  TABLE 11                                                        ______________________________________                                        b7   line21.sub.-- switch.sub.-- 1                                            ______________________________________                                        0    user.sub.-- data() for line21 data for Field 1 is not recorded in             GOP                                                                           layer of Video stream                                                    1    user.sub.-- data() for line21 data for Field 1 is recorded in GOP             layer                                                                         of Video stream                                                          ______________________________________                                    

b6 of line 21₋₋ switch₋₋ 2 is given as in the following table 12.

                  TABLE 12                                                        ______________________________________                                        b6   line2l.sub.-- switch.sub.-- 2                                            ______________________________________                                        0    user.sub.-- data() for line21 data for Field 2 is not recorded in             GOP                                                                           layer of Video stream                                                    1    user.sub.-- data() for line21 data for Field 2 is recorded in GOP             layer                                                                         of Video stream                                                          ______________________________________                                    

b5-3 of the source picture resolution is given as in the following table13.

                  TABLE 13                                                        ______________________________________                                        b5-b3    source picture resolution                                            ______________________________________                                        000      720*480 (525/60 system), 720*576 (625/50 system)                     001      704*480 (525/60 system), 704*576 (625/50 system)                     010      352*480 (525/60 system), 352*576 (625/50 system)                     011      252*4240 (525/60 system), 352*288 (625/50 system)                    others   reserved                                                             ______________________________________                                    

The source picture letterboxed b2 indicates whether or not the videooutput is letterboxed. As stored in table 14, when the aspect ratiob11-b10 is "01" (16:9), "0" is recorded. Or, when the aspect ratio is"00" (4:3), "0" or "1" is recorded. The value of b2 is given as in thefollowing table 14.

                  TABLE 14                                                        ______________________________________                                        b2             source picture letterboxed                                     ______________________________________                                        0              source letterboxed                                             1              letterboxed                                                    ______________________________________                                    

b0 of the film camera mode indicates the source picture mode for 625/50system. "0" is recorded when b13-b12 of the TV system are "00" (525/60),while "1" is recorded when b13-b12 thereof are "01" (625/50). b0 valueof the film camera mode is given as in the following table 15.

                  TABLE 15                                                        ______________________________________                                               b0         file camera mode                                            ______________________________________                                               0          camera mode                                                        1          file mode                                                   ______________________________________                                    

VTS₋₋ SPST₋₋ ATRT recorded at RBP 598-RBP 789 of the VTSI₋₋ MAT of FIG.4 is recorded. Herein, VTS₋₋ SPST₋₋ ATRT is indicative of each ofsub-picture stream attributes for the VTSTT₋₋ VOBS within the VTS. OneVTS₋₋ SPST₋₋ ATR indicates each of the sub-picture streams. The streamnumbers are assigned from 0 depending upon the order represented by theVTS₋₋ SPST₋₋ ATR. When the address of the sub-picture stream is lessthan 32, 0 is recorded at all of bits of the non-used VTS₋₋ SPST₋₋ ATRs.FIG. 6B shows the structure of VTS₋₋ SPST₋₋ ATR according to theembodiment of the present invention, which is the information recordedat the VTS₋₋ SPST₋₋ ATR of the DVD-audio.

For the time being, b47-b45 representative of the sub-picture codingmode and the extended audio mode is given as in the following table 16.

                  TABLE 16                                                        ______________________________________                                        b47-b45       sub picture coding mode                                         ______________________________________                                        000           Run-length for 2 bits/pixel                                     001           reserved (for extended sub picture)                             111           extended audio data                                             others        reserved                                                        ______________________________________                                    

As apparent from the above table 16, in recording the extended audiodata at the video stream, 111 is recorded as the sub-picture codingmode. Otherwise, the value corresponding to the really-used sub-picturecoding mode is recorded.

b41-b40 of the sub picture type is given as in the following table 17.

                  TABLE 17                                                        ______________________________________                                               b41-b40     sub picture type                                           ______________________________________                                               00          Not specified                                                     01          Language                                                          others      reserved                                                   ______________________________________                                    

The specific code as indicated in FIG. 6B is the language code capableof being indicated as the sub-picture, and the specific code and thespecific code extension are defined by a separate way.

FIG. 7 shows a directory structure in case an audio title of a basicaudio area and an audio title of an extended audio area are separatelyprovided according to the embodiment of the present invention, and thestructure of the VTSI. In FIG. 7, VTS #1 uses the video stream as theextended audio stream and the sub-picture stream as the originalsub-picture stream, and VTS #2 uses the video stream and the sub-picturestream as the extended audio stream.

VTSI₋₋ MAT including VTS₋₋ V₋₋ ATR and VTS₋₋ SPST₋₋ ATR as explainedabove is positioned in the video title set information VTSI of the videotitle set VTS as shown in FIG. 3. Moreover, the video pack as shown inFIG. 8A as the real data, the sub-picture pack as shown in FIG. 8B, andnot-shown audio pack are stored as VTSTT₋₋ VOBS of VTS. FIG. 8A showsthe relation between VOBU and a video pack and FIG. 8B shows therelation between a header of a sub-picture unit (SPU) and a sub-picturepack. The video pack, the sub picture pack, and the audio pack have,respectively, header information indicating the information of thecorresponding pack.

FIG. 9 shows the structure of the extended audio stream for recordingthe extended audio data according to the embodiment of the presentinvention. With reference to FIG. 9, the extended audio streams includeone extended audio stream header and M frames.

Here, the extended audio stream header comprises the channel headerscorresponding to the number N of channels and information indicative ofthe number of the channels. The N channel headers further includeinformation such as the channel number of the corresponding channel, thecoding mode, the usage, the quantization bits and the samplingfrequency.

The channel number of the extended audio channel header includes 4 bitsand thereby, can express a maximum of 16 channels of 0000b-1111b.

The coding mode of the extended audio channel header is indicative ofthe coding mode of the extended audio data and includes 4 bits. Theaudio coding modes as shown in table 18 can be used in the embodiment ofthe present invention.

                  TABLE 18                                                        ______________________________________                                                       extended audio coding mode                                     ______________________________________                                        0000           LPCM                                                           0001           DTS                                                            0010           bitstream coding                                               0011           lossless coding                                                0100           ADPCM                                                          0101           8 bit fs                                                       others         reserved                                                       ______________________________________                                    

The usage area value of the extended audio channel header has 3 bits,which indicates the usage of the extended audio data recorded at thecorresponding channel upon using the extended audio data. Namely, oncethe usage area value is "000", the extended audio data is the bitextension of the basic audio data. Once the usage value is "001", thesampling frequency of the extended audio data is the bandwidth extensiondata as two times as the sampling frequency of the basic audio data.When the usage area value is "010", there is the bandwidth extensiondata that the sampling frequency of the extended audio data is equal tothat of the basic audio data. When the usage area value is "011", theextended audio data is the channel extension of the basic audio data,and it is indicated that it is necessary to perform a cross-correlationprocess with the basic audio channel for reproducing. When the usagearea value is "100", it is indicated that the basic audio channel andthe extended audio channel are simply additionally reproduced. The usagearea value is given as in the following table 19.

                  TABLE 19                                                        ______________________________________                                                    usage                                                             ______________________________________                                        000         bit extension                                                     001         high-band-only bandwidth extension                                010         2-band representation bandwidth extension                         011         channel extension to be cross-correlated                          100         simple channel extension                                          others      reserved                                                          ______________________________________                                    

The quantization bits of the extended audio channel header includes 5bits, which are given as in the following table 20.

                  TABLE 20                                                        ______________________________________                                                    quantization bits                                                 ______________________________________                                        00000       not meaningful (in case data compression coding                               scheme is used)                                                   00001-01000 16bit - 8bit                                                      10000-11000 16bit - 24bit                                                     others      reserved                                                          ______________________________________                                    

The sampling frequency of the extended audio channel header is comprisedof 3 bits, which is given as in the following table 21.

                  TABLE 21                                                        ______________________________________                                                           sampling frequency                                         ______________________________________                                               000         48KHz                                                             001         96KHz                                                             010         192KHz                                                            011         384KHz (8 fs)                                                     100         3.702Mhz (64 fs)                                                  others      reserved                                                   ______________________________________                                    

In the embodiment of the present invention, the disc for recording theextended audio data in the video pack of the DVD-video disc and/or thesub-picture pack thereof is referred to as the DVD-audio disc (theDVD-audio disc having audio data stored in the sub-picture and/or videopack and the DVD-video disc does not). Various methods are used forrecording the extended audio data. As shown in FIG. 9, the extendedaudio data is divided into the header and the real data, and the realaudio data is divided into frames.

To record the whole stream in the disc, the same method as that of theDVD-video is used. In the case that the video stream stores the extendedaudio data, the extended audio data is really stored in the video pack.In the case that the sub-picture stream stores the extended audio data,the audio data is actually stored in the sub-picture pack.

FIGS. 10A to 10C show examples of the structure of the physical data ofthe extended audio stream, wherein FIG. 10A is a diagram illustratingthe format that the extended audio stream is recorded in the video areaand the sub-picture area, FIG. 10B is a diagram illustrating the formatthat the extended audio stream is recorded in the video area, and FIG.10C is a diagram illustrating the format that the extended audio streamis recorded in the sub-picture area. As depicted in FIGS. 10A to 10C,the extended audio data can be recorded by selectively using only onestream of two streams of the video stream and the sub-picture stream orusing both of the two streams. At this time, upon using two streams asthe extended audio data, the synchronization of the pack uses the PTS.

The data of the extended audio data stream is made by sequentiallycombining the packs. The data within the frames is stored by beingseparated by the channel, and the stream header records information justlike whole information, the coding system of each channel, and the usagemethod. When using the extended audio data with the method as shown inFIG. 9, the bit extension data (0.7 Mbps) of 4 bits at LPCM (3.75 Mbps)of 48 KHz and 20 bits having 4 channels of the basic area, 48 KHz-96 KHzand 24 bits bandpass extension data (1.125 Mbps) which is compressed byDTS (Digital Theater Systems), and 96 KHz and 24 bits extension 2channel data (1.125 Mbps) fullpass-recorded with DTS, are added, therebyrecording the value of each channel header as in the following table 22.

                  TABLE 22                                                        ______________________________________                                        channel #                                                                             coding mode                                                                              usage   # of bits                                                                            fs    etc.                                  ______________________________________                                        0000    0000       000     00100  000   note1                                 0000    0001       010     00000  000   note2                                 0001    0000       000     00100  000   note3                                 0001    0001       010     00000  000   note4                                 0010    0000       000     00100  000   note5                                 0010    0001       010     00000  000   note6                                 0011    0000       000     00100  000   note7                                 0011    0001       010     00000  000   note8                                 0100    0001       011     00000  001   note9                                 0101    0001       011     00000  001   note10                                ______________________________________                                    

In regard to the above table 22, note 1-note 10 are as follows: note 1indicates the bit extension of channel 0 as 48 KHz, 4 bits LPCM; note 2indicates 48 KHz-96 KHz bandwidth extension of channel 0 as 48 KHz DTS;note 3 indicates the bit extension of the channel 1 as 48 KHz, 4 bitsLPCM; note 4 indicates 48 KHz-96 KHz of the channel 1 as 48 KHz DTS;note 5 indicates the bit extension of the channel 2 as 48 KHz, 4 bitsLPCM; note 6 indicates 48 KHz-96 KHz bandwidth extension of the channel2 as 48 KHz DTS; note 7 indicates the bit extension of the channel 3 as48 KHz, 4 bits LPCM; note 8 indicates 48 KHz-96 KHz bandwidth extensionof the channel 3 as 48 KHz DTS; note 9 indicates the channel extensionof the channel 4 as 96 KHz DTS; and note 10 indicates 96 KHz channelextension of the channel 5 as 96 KHz DTS.

The device for reproducing the DVD-audio disc is constructed with abasic audio decoder for reproducing the audio of the basic area and anextended audio decoder for reproducing the audio of the extended area,which combines the audio data decoding-output in the two audio decodersas explained hereinbefore, thereby reproducing the audio at highcapacity and high sound quality. The extended audio data is recorded inthe video area, the sub-picture area, or another stream, or in all ofthe areas.

Therein, the basic audio data is capable of being recorded with thesystem such as LPCM, AC-3, MPEG-2, DTS, and SDDS regulated in theDVD-video, wherein the sound quality should be high in accordance withLPCM. At present, it has been well-known that the LPCM and DTS havingthe capacity of 24 bits is suitable for recording a music signal.

The extended audio data is added to the signal recorded in the basicarea, to enhance the capacity or to provide the music of the samecontent as that of the basic area at high resolution, wideband, andmultichannel. In case of providing the same audio as that of the basicarea, the extended audio data is recorded as another title, so that theextended audio data can be played by itself. Upon usage with beingcombined with the basic area, the extended audio data can be used toincrease the number of the quantization bits of the signal recorded atthe basic area or to increase the bandwidth, and to record the data ofthe sub-channel which is not recorded in the basic area. The databelonging to the above are can use others systems except for LPCM andDTS and other systems can support the sound quality characteristic inconformity with LPCM.

The extended audio data is recorded by being divided into the formatdesignation and the real data. The extended data can be recorded by thechannel and by the bandpass. The content of the extended audio data isdivided as below. Firstly, on increasing the number of the bits, theextended area data is comprised of lower bits which can not be recordedin the basic area at a maximum of 24 bits. Secondly, on extending thebandwidth, the high-pass component is recorded or the signal of thechannel which is not included in the basic area is recorded throughoutall of bandpass using the system of recording the only bandpass which isnot included in the basic area, as the high sampling frequency, or withusing 2-bands expression method using a perfect reconstruction FIRfilter.

The DVD-audio can record the basic audio data and the extended audiodata in the single title set as stated previously. Also, the audio dataincluding only other extended audio data can be stored in another title.As illustrated in FIG. 7, two title sets are registered in the videotitle directory VIDEO₋₋ TS and VTS of each title set includesinformation for the attributes of VTS₋₋ SPST₋₋ ATR and VTS₋₋ V₋₋ ATR.The field includes the information for the video and sub-picturestreams. Here, in the event of recording the extended audio data in thevideo stream, 11b is recorded in the video compression mode area of theVTS₋₋ V₋₋ ATR. However, in the event of recording the extended audiodata in the sub-picture stream, 111b is recorded in the sub-picturecoding mode area.

Hereinafter, when the VTS information is read for reproducing the title,since various information of each stream is recorded, the device forreproducing the DVD audio instructs operations of each of the decodersduring a time when the corresponding title is reproduced. Accordingly,before reproducing the title, the coding mode information of the videostream and the sub-picture stream are read to set the operation modes ofeach decoder. At this moment, as shown in FIG. 7, the basic audio datais 6 channels, 48 KHz, 20 bits multichannel LPCM (5.6 Mbps), and 4 Mbpsextended audio data and the sub-picture can be recorded in the title.Unlike that, 192 KHz, 24 bit, 8 channels DTS stream (9 Mbps) as othertitle is recorded in the video stream and the sub-picture stream. InFIG. 7, two VTSs are registered in the VIDEO₋₋ TS. In the reproducingdevice having a DTS decoding function, a user can reproduce the title inwhich the DTS stream is recorded, or the title including thebasic/extended LPCM. Without a DTS decoding function, the user can hearthe title only by reproducing the title recorded with the LPCM. If thedevice for reproducing the DVD video reproduces the title including DTS,the screen picture is provided without a title.

A high sound quality reproducing method according to the embodiment ofthe present invention is used by combing the extended audio data withthe basic audio data, which is largely divided into the bit extension,the frequency bandwidth extension, and channel extension.

Once a signal of the basic area is recorded as the quantization bitsless than 24 bits, a non-recorded lower bit is recorded as the bitextension method. Upon reproducing, the data reproduced at the basicaudio area is output as the upper bit and the data reproduced at theextended audio area is output as the lower bit, so that two pieces ofdata can be combined with each other to thereby be reproduced.

FIG. 11 shows a method for combining the basic area data and theextended area data in an audio decoder and increasing the number of bitsaccording to the embodiment of the present invention. In FIG. 11, thebasic audio data is the audio data of 20 bits and the extended audiodata is the audio data of 4 bits. In FIG. 11, the 20 bits basic audiodata of the basic audio area output from an audio decoder 11 is appliedto a first buffer 12 having 20 bits size, and the 4 bits extended audiodata of the extended audio area is applied to a second buffer 12 havingthe 4 bits size. After that, since a third buffer 14 having 24 bits sizestores the basic audio data of 20 bits output at the first buffer 12 atthe upper bit area and the extended audio data of 4 bits output in thesecond buffer 13 as the lower bit area, the third buffer 14 combines thebasic audio data and the extended audio data with each other as theaudio data of 24 bits. Following that, because the combined 24 bitsaudio data is output by controlling the third buffer 14, the number ofthe bits is extended. Specifically, although the 24 bits audio data cannot be recorded at the basic audio data area due to the bit ratio limitof the multichannel bit ratio, a bit extension method can reproduce theaudio data of good quality by storing the extended audio data in thelower bit area.

The above frequency bandwidth extension method is used upon combiningthe audio signals at high-pass and low-pass and is mainly divided intotwo. Firstly, a first frequency bandwidth extension method is tooversample the data of the basic audio area to conform the data of thebasic audio area and the data of the extended audio area with each otherand to combine the oversampled data with the data of the extended audioarea. Next, a second frequency bandwidth extension extends the bandwidthby using a perfect reconstruction FIR filter as the data of the 2 bandexpression system.

FIG. 12A shows the method of frequency-converting the basic area data atthe audio decoder, combining the frequency-converted data with high-passof the extended area, and extending the bandpass according to theembodiment of the present invention, which assumes the case where thedata of the basic audio area has 96 KHz sampling frequency and the dataof the extended audio area has 192 KHz sampling frequency. Centeringaround FIG. 12A, if the audio decoder 11 outputs the 96 KHz samplingdata of the basic audio area, a 2-times oversampling digital filter 152-times oversamples the basic audio data, converts the oversampled datainto the audio data of 192 KHz, and outputs the converted data. Also, anadder 16 adds the oversampled 192 KHz basic audio data to the 192 KHzextended audio data of the extended audio area output from the audiodecoder 11, thereby outputting the full bandpass audio data of 192 KHz.As mentioned hereinbefore, in the first frequency extension method, thedata of the extended audio area records the data of the extended audioarea having the 2-times sampling frequency of the basic audio data whenthe data of the basic audio area has the low sampling frequency. Uponreproducing, the basic audio data is combined with the extended audiodata after 2-times oversampling of the basic audio data, therebyextending the bandwidth.

FIG. 12B shows the method for combining the basic area data and theextended area data expressed as 2-bands at the audio decoder andextending the bandpass according to the embodiment of the presentinvention. Therein, the basic audio data is N sample audio data of 0-96KHz and the extended audio data is N sample audio data of 96-192 KHz.With reference to FIG. 12B, the audio decoder 11 outputs the basic audiodata of 0-96 KHz and the extended audio data of the 96 KHz-192 KHz Nsamples. Thus, the perfect reconstruction FIR filter 17 combines thebasic audio data and the extended audio data output from the audiodecoder 11, outputs the full bandpass audio data of 2N samples, andextends the bandwidth.

The channel extension method is included with first channel extensionmethod by cross-correlation processing the channel of the basic area andthe added channel so as to remove the channel of the extended audio dataalready-combined at the basic audio data, and second channel extensionmethod for additionally reproducing simply new channel.

FIGS. 13A and 13B show the reproducing examples of the case that theeffect channel is recorded in the extended area, wherein FIG. 13A is theprocess of separating an original basic signal by using the basicchannel and the extended channel. In FIG. 13A, the channel of the basicaudio data is 5 channels and the channel of the extended audio data is 2channels. Referring to FIG. 13A, an input data buffer 21 buffers andoutputs the reproduced data of the basic audio area and the extendedaudio area. In this case, a basic audio decoder 23 outputs the audiodata of 5 channels (front, left, center, front right, rear left, andrear right) of the basic audio data. As well, an extended audio decoder22 outputs the audio data of 2 channels (front upper and subwoofer) ofthe extended audio data. Then, after receiving the audio data of the 7channels output in the extended audio decoder 22 and the basic audiodecoder 23, a cross-correlation processor 24 cross-correlates thechannel of the basic area and the added channel, thereby extending thechannel while removing the audio signal of the extended channel combinedat the basic data.

FIG. 13B is the process of intactly reproducing the basic channel andthe extended channel. In FIG. 13B, the channel of the basic audio datais 5 channels and the channel of the extended audio data is 2 channels.Referring to FIG. 13B, the input data buffer 21 buffers and outputs thereproduced data of the basic audio area and the extended audio area. Inthis case, the basic audio decoder 23 outputs the audio data of 5channels (front, left, center, front right, rear left, and rear right)of the basic audio data. As well, the extended audio decoder 22 outputsthe audio data of 2 channels (front upper and subwoofer) of the extendedaudio data. The second channel extension method intactly outputs theaudio data of the channel of the basic area and the added channel.

The device for using the DVD-audio as described above can be replacedwith a device for combining a general DVD-video and the DVD-audioaccording an embodiment of the present invention and the DVD-audioprivate reproducing device.

FIG. 14 shows the structure of privately reproducing data from only aDVD-audio disc without expression of a moving picture according to theembodiment of the present invention. In FIG. 14, a system controller 102controls overall operations of the DVD-audio disc reproducing device andperforms the user interface function. The system controller 102 analyzesthe video title set information VTSI and judges DVD-video and DVD-audio.At this point, the system controller 102 analyzes the coding mode of theVTS₋₋ V₋₋ ATR and VTS₋₋ SPST₋₋ ATR in the information of the VTSI and,upon recording the extended audio data at one stream of the video streamand the sub-picture stream, judges that the DVD-audio exists, therebycontrolling the reproducing function of the DVD-audio. However, when thebit stream and the sub-picture stream are in the state where theextended audio data is not recorded, the system controller 102 judgesthat the DVD-video exists, thereby performing the reproducing operationof the audio data recorded at the basic audio data.

A mechanism & pick-up unit 104 reads the data recorded on the DVD-audiodisc. A data receiver 106 analyzes and corrects the error of the audiodata output from the mechanism & pick-up unit 104. The data receiver 106includes an error correction circuit (hereinafter, referred to as ECC).A servo controller for performing all kinds of servo functions bycontrolling the driving of the mechanism & pick-up unit 104 under thecontrol of the system controller 102 is omitted in FIG. 14.

A system parser 108 separates the sub-picture stream, the video streamand the audio stream in the DVD data streams output from the datareceiver 106 under the control of the system controller 102 and outputsthe separated stream. An audio decoder 110 includes a basic audiodecoder and an extended audio decoder. The audio decoder 110 receivesthe sub-picture stream, the video stream, and the audio stream, outputfrom the system parser 108, decodes the basic audio data and theextended audio data by enabling corresponding decoders under the controlof the system controller 102, combines the decoded audio data and theextended audio data, and outputs the combined data as the digital audiodata.

An audio outputter 112 converts the inputted data into the digital audiodata and the analog audio signal according to the characteristic of thedevice for reproducing the data with input of the decoded audio dataoutput in the audio decoder 110 and outputs the converted data.

Regarding the construction of FIG. 14, there is the case where thesub-picture stream and the video stream are used as the extended audiostream. However, in the case of using the video stream as the extendedaudio stream and the sub-picture stream as the sub-picture data of thereproduced audio, another sub-picture decoder for decoding thesub-picture stream should be additionally included in the deviceaccording to the present invention, except for the audio decoder 110.Then, the sub-picture data can be the language information for the audioreproduced.

The audio decoder 110 further includes the basic audio decoder and theextended audio decoder so as to decode the basic audio data and theextended audio data according to the embodiment of the presentinvention, as illustrated in FIG. 15. FIG. 15 shows the structure of theaudio decoder 110 for decoding the audio data recorded on the disc inthe DVD audio private reproducing device of FIG. 14.

With reference to FIG. 15, an input data buffer 154 inputs thesub-picture stream data, the video stream data, and the audio streamdata output from the system parser 108, outputs the sub-picture streamdata and the video stream data as the extended audio stream, and storesthe audio stream data in the basic audio stream.

A basic audio decoder 156 includes the decoders corresponding to thecoding modes of the audio data recorded in the audio stream of theDVD-audio. The basic audio decoder 156 is composed of LPCM decoder andDTS decoder (option) depending on the audio decoding mode of theDVD-video. The basic audio decoder 156 inputs the audio stream of thebasic audio area output from the input data buffer 154, anddecoding-outputs the basic audio data input by driving the decodercorresponding to the audio coding mode of the basic audio stream by thecontrol of a decoding controller 152.

An extended audio decoder 158 includes the decoders corresponding to thecoding modes of the audio data recorded at the extended audio stream ofthe DVD-audio. The extended audio decoder 158 can further have apseudo-lossless psychoacoustic coding decoder, a bitstream decoder and alossless coding decoder. The extended audio decoder 158 inputs the audiostream of the extended audio area output from the input data buffer 154and decoding-outputs the extended audio data input by driving thedecoder corresponding to the audio coding mode of the extended audiostream under the control of the decoding controller 152.

The extender 160 analyzes the usage value positioned in thecorresponding channel header of the extended audio data output from theextended audio decoder 158 and the basic audio data output from thebasic audio decoder 156 and performs the functions such as bitextension, the bandwidth extension, and the channel extension. The bitextension method is performed by combining the data of the basic audioarea and the data of the extended audio area as shown in FIG. 11 andextending the number of the bits. The bandwidth extension method isperformed by frequency-converting the data of the basic audio area,combining the frequency-converted data with the high-pass audio data ofthe extended audio area and extending the bandwidth as shown in FIG.12A, or by combining the data of the basic audio area having the 2 bandsexpression system with the audio data of the extended audio area andextending the bandwidth as shown in FIG. 12B. The channel extensionmethod is performed to cross-correlation process the channel of thebasic audio data and the channel of the extended audio data, therebyremoving the signal of the channel of the extended audio data combinedwith the basic audio data as shown in FIG. 13A, or intactly reproducingthe channel of the basic audio data as the channel of the extended audiodata as shown in FIG. 13B. In this case, the extender 160 becomes abit/bandwidth/channel extender, which inputs the basic audio data of thebasic channel output from the basic audio decoder 156 and the extendedaudio data of the basic channel output from the extended audio decoder158 and combines two types of audio data, so that the output audio datacan be output after the bit extension or/and the bandwidth extension.

An output data buffer 162 inputs and stores the audio data output fromthe extender 160.

The decoding controller 152 generates control signals for controllingoperation for all of components of the audio decoder 110 under thecontrol of the system controller 102.

FIG. 16 is a flow chart illustrating the process of initializing theaudio decoder to reproduce the title in the DVD-audio privatereproducing device having the same structure as that of FIG. 14. Inregard of FIG. 16, in the reproducing mode, the system controller 102drives the mechanism & pickup unit 104 and reads the VTSI information ofthe title to be reproduced in the data read from the disc in step 211.After that, in step 213, the system controller 102 analyzes theattribute information of the video stream after reading b15-b14 of VTS₋₋V₋₋ ATR of VTSI₋₋ MAT. At this point, the VTS₋₋ V₋₋ ATR has theconstruction equal of that of FIG. 6A, and the value of b15-b14 becomesthe video compression mode information. In this event, when the value ofb15-b14 is "11", it is checked that the extended audio mode exists. But,when b15-b14 has other values except for "11", it is checked that theextended audio mode did not exist. Therefore, when the value of b15-b14of VTS₋₋ V₋₋ ATR is "11", the system controller 102 proceeds to step217, thereby controlling the system parser 108 and the audio decoder 110to enable the audio decoding of the video stream. However, when checkedin the above step 213 that the value of b15-14 of VTS₋₋ V₋₋ ATR is oneof "00", "01", and "10", the system controller 102 proceeds to step 215,thereby controlling the system parser 108 and the audio decoder 110 todisable the audio decoding of the bit stream.

After performing the foregoing step 215 or 217, in step 219, the systemcontroller 102 analyzes the attribute information of the sub-picturestream by reading b47-b45 of VTS₋₋ SPST₋₋ ATR of the VTSI₋₋ MAT. In thisinstance, VTS₋₋ SPST₋₋ ATR has the construction equal to that of FIG.6B, and the value of b47-b45 becomes the sub-picture coding modeinformation. In this event, when the value of b47-b45 is "111", it ischecked that the extended audio mode exists. But, when the value thereofis "000", it is checked that the sub-picture mode exists. Also, whenb47-b45 has other values except for "000" and "111", it is checked thatthe reserved state exists. Therefore, when checked in the aforementionedstep 219 that the value of b47-b45 of VTS₋₋ SPST₋₋ ATR is "111", thesystem controller 102 proceeds to step 225, thereby controlling thesystem parser 108 and the audio decoder 110 to enable the audio decodingof the sub-picture stream and to disable the sub-picture decoding.However, when checked in the above step 219 that the value of b47-455 ofVTS₋₋ SPST₋₋ ATR is "000", the system controller 102 proceeds to step223, thereby controlling the system parser 108 and the audio decoder 110to disable the audio decoding of the bit stream and to enable thesub-picture decoding. In this case, the sub-picture data can be theaudio title information of the title reproduced. Also, when checkedtherein that b47-45 of VTS₋₋ SPST₋₋ ATR has another value except for"111" and "000", the system controller 102 proceeds to step 221, therebycontrolling the system parser 108 and the audio decoder 110 to disablethe audio decoding of the sub-picture stream and sub-picture decoding.

The system controller 102 checks the coding mode of the sub-picturestream and the coding mode of the video stream for the VTSI informationreproduced in the disc, analyzes whether or not the data of thecorresponding stream, is the extended audio data, and controls theextended audio decoder 158 of the audio decoder 110 to be driven in caseof the stream of the extended audio mode.

As stated hereinafter, in the reproducing mode of the DVD-audio that theextended audio data is recorded, the system controller 102 drives theaudio decoder 110. Thus, the audio decoder 110 performs steps of FIGS.17A and 17B then to decode and extend the audio data. FIGS. 17A and 17Bare flow charts illustrating the processes of the extended audio decoderand the bandpass extender in the DVD-audio reproducing device.

Referring to FIGS. 17A, 17B, and 17C, the decoding controller 152 checksin step 311 or 315 whether or not the video stream and the sub-picturestream are the extended audio data in accordance with the control dataoutput from the system controller 102. At this time, when checked in theabove step 311 that the video stream was not the extended audio data,the decoding controller 152 discards the video stream in step 313.Further, when checked in the above step 315 that the sub-picture streamwas not the extended audio data, the decoding controller 152 discardsthe sub-picture stream data in step 317.

However, when checked in the above steps 311 and 315 that the videostream and the sub-picture stream were the extended audio stream, thedecoding controller 152 initializes the video stream variable i and thesub-picture stream variable j as 0 in step 321. Hereinafter, thedecoding controller 512 compares the current video pack V₋₋ PCK[i].PTSwith the current sub-picture pack SP₋₋ PCK[j].PTS in step 323. At thismoment, when checked in the foregoing step 323 that V₋₋ PCK[i].PTS=SP₋₋PCK[j].PTS, the decoding controller 152 stores the current V₋₋ PCK[i] atthe extended decoding buffer in step 325, stores the current SP₋₋ PCK[j]at the extended decoding buffer in step 327, and changes variables inconformity with i=i+1 and j=j+1 in step 329. However, when checked inthe aforesaid step 323 that V₋₋ PCK[i].PTS<SP₋₋ PCK[j].PTS, the decodingcontroller 152 stores the current V₋₋ PCK[i] at the extended decodingbuffer in step 333 and changes the variable in conformity with i=i+1 instep 335. Otherwise, when checked in the step 323 that V₋₋PCK[i].PTS>SP₋₋ PCK[j].PTS, the decoding controller 152 stores thecurrent SP₋₋ PCK[j] at the extended decoding buffer in step 337 andchanges the variable in conformity with j=j+1 in step 339. After theforegoing steps 329, 335, and 339, the decoding controller 152 checks instep 331 whether or not all of the packs are stored at the extendeddecoding buffer. Thus, when checked that all of the packs are not storedthereat, the decoding controller 152 returns to the above step 323,thereby repeatedly performing the above steps. However, when checkedthat all of the packs are stored thereat, the decoding controller 152proceeds to step 341 of FIG. 17B.

The decoding controller 152 performs the decoding of the extended audiodata in step 341 and checks in step 343 whether or not the audio packsof the same PTS are decoded. Thus, when checked that the audio packs ofthe same PTS are not decoded, the decoding controller 152 returns to theabove step 343, thereby standbying the audio pack decoding completion.However, when checked that the audio packs of the same PTS are decoded,the decoding controller 152 initializes the channel header variable c ofthe extended audio stream header having the construction equal to thatof FIG. 9 as 0.

Thereafter, in step 347, the decoding controller 152 checks the usagevalue of the headers corresponding to the current c'th channel andchecks whether or not the bit extension exists in the c'th channel. Atthis moment, when checked that bit extension existed therein, thedecoding controller 152 proceeds to step 349, thereby combining thesamples for conforming the decoding output of the basic audio stream andthe decoding output of the extended audio stream, so as to perform thebit extension by controlling the extender 160. In this case, the bitextension method performed in the extender 160 is to combine the basicaudio data with the extended audio data so as to increase the bits, asillustrated in FIG. 11.

When checked that the bit extension did not exist therein or afterperforming the step 349, the decoding controller 152 checks the usagevalue of the corresponding channel header c and, thus the bandwidthextension method in step 351. At this point, when the usage valuethereof is "010", the decoding controller 152 controls the extender 160in step 353, so that the basic audio data and the extended audio data ofthe 2-bands expression system can be combined with each other to therebyperform the bandwidth extension, as depicted in FIG. 12B. Also, when theusage value thereof is "001", the decoding controller 152 controls theextender 160 in step 355, thereby oversampling the basic audio data,thereby combining the oversampled basic audio data with the high-pass ofthe extended audio data and performing the bandwidth, as illustrated inFIG. 12A.

When checked in the above step 351 that the bandwidth extension did notexist or after performing the above step 353 or 355, the decodingcontroller 152 checks in step 357 of FIG. 17C whether or not the bitextension or the bandwidth extension of all of the extended audio datais completed. Thus, when checked that the bit extension or the bandwidthextension of all of the extended audio data is not completed, thedecoding controller 152 proceeds to the step 359, thereby changing thevariable for designating the next channel header as c=c+1 and thenreturning to the above step 347 so as to repeat the above steps.

However, when checked in the above step 357 that the bit extension orthe bandwidth extension of all of the extended audio data is completed,the decoding controller 152 proceeds to the step 361, thereby checkingwhether or not the cross-correlation process is necessary for channelextension, by examining the usage area if any of the usage area contains"011." Here, when checked that the cross-correlation process wasnecessary for channel extension, the decoding controller 152 proceeds tostep 363, thereby performing cross-correlation processing of the channelof the basic audio data and the channel of the extended audio data andremoving the signal in the channel of the extended audio data combinedwith the channel of the basic audio data. To the contrary, when checkedin the above step 361 that the cross-correlation process is notnecessary for channel extension, the decoding controller 152 adds thechannel of the extended audio data to the channel of the basic audiodata and outputs the added channel. After processing the channelextension as described above, the decoding controller 152 controls theoutput data buffer 162, stores the extended decoding audio data combinedat the output data buffer 162, and informs the system controller 102 ofthe result in step 365.

Concerning the operation of the DVD audio private reproducing deviceaccording to an embodiment of the present invention which performs thecontrol operations as shown in FIGS. 16 and 17A through 17C and has theconstruction of FIGS. 14 and 15, the system controller 102 controlsmechanisms, optical systems, and overall circuits of the reproducingdevice, controls the operation of the above device according to anoperation of a user and performs the function of indicating theoperation state. The mechanism & pick-up unit 104 reads the datarecorded at the disc under the control of the system controller 102 andthe driving mechanism of the mechanism & pick-up unit 104 performs allkinds of servo functions, for example, the spindle servo, the trackingservo, the focusing servo, etc., by the control of the servo controller.Thus, the data receiver 106 converts an RF signal output from themechanism & pick-up unit 104 into the digital data and performs theerror correction function of the converted digital data. The systemparser 108 separates the video data, the audio data, the sub-picturedata and the control data from the error-corrected digital audio data bythe function thereof and transmits the separated data to the audiodecoder 110, by the control of the system controller 102.

Then, the audio decoder 110 decodes and outputs the audio data and thevideo data transmitted from the system parser 108. At this case, theaudio data is comprised of the basic audio data recorded at the audiostream and the extended audio data recorded at the video stream and thesub-picture stream. With respect to the operation of the audio decoder110, the audio/video/sub-picture stream data output from the streamparser 108 is stored at the input data buffer 154. Thus, the decodingcontroller 152 initializes the basic audio decoder 156 and the extendedaudio decoder 158 by the control of the system controller 102.

The basic audio decoder 156 decodes the coding audio stream with PCM orother methods and outputs the PCM. Also, the extended audio decoder 158converts and outputs the audio data existed in the video/sub-picturestream into the PCM data. The extended audio data can be PCM data,lossless coding data, bit stream data and pseudo-lossless psychoacousticcoding data. In this instance, the extended audio decoder 158 convertsthe extended audio data input by operating the decoder corresponding tothe coding system into the PCM data. Then, in the case of reproducingthe DVD-video, since the video data and the sub-picture data are inputto the video/sub-picture stream, the extended audio decoder 158 is notoperated.

The audio data output from the basic audio decoder 156 and the extendedaudio decoder 158 is applied to the extender 160, and the extender 160performs the function such as the bit extension, the bandwidthextension, and the channel extension by combining the two PCM audiodata. Herein, the extender 160 is also not operated upon reproducing theDVD-video. After being stored at the output data buffer 162, thefinally-generated audio data is converted into the digital audio dataformat (IIS or EIAJ), to be thereby output to the audio outputter 112.

The audio decoder 110 as mentioned previously, decodes the basic audiodata, analyzes the information recorded in the video and sub-picturestreams, and checks whether the analyzed information is the video andsub-picture data or the extended audio data. After checking, when theanalyzed information is the video data, the audio decoder 110 disablesthe decoding operation of the extended area. On the other hand, when theanalyzed information is the extended audio data, the audio decoder 110enables the decoding operation of the extended area. After completion ofthe decoding operation, the audio decoder 110 combines the audio data ofthe extended area with the audio data of the basic area, generates theaudio data of the high-pass having the high resolution and wideband andprocesses the added channel as the audio channel of the basic area to bereproduced. When the audio data is generated at the full channel andfull bandpass, the audio decoder 110 converts the sampling frequency andthe quantization bit number to meet the generated audio data inconformity with the input format of the audio outputter 112. If thesampling frequency of the decoded audio data is more than that inputfrom the audio outputter 112, the audio decoder 110 performs adecimation operation. Otherwise, the audio decoder 110 performs theoversampling. When the quantization bit number of the decoded audio datais more than that of the audio outputter 112, the audio decoder 110performs bit truncation/rounding or requantization, and noise shaping.Otherwise, the methods of adding a decoder or adding 0 bit at the lowerbit are used.

FIG. 18 shows the structure of a device for commonly reproducing boththe DVD-video disc and the DVD-audio disc according to the embodiment ofthe present invention. A system controller 402 controls overalloperations of the DVD-audio disc reproducing device and performs theuser interface function. The system controller 402 analyzes the videotitle set information VTSI and checks whether the analyzed informationis the DVD video or the DVD audio. At this time, after analyzing thecoding mode of VTS₋₋ V₋₋ ATR and VTS₋₋ SPST₋₋ ATR in the information ofthe VTSI, upon recording the extended audio data at one stream of thevideo stream and the sub-picture stream, the system controller 402judges that the analyzed information is the DVD-audio, thereby enablingthe extended audio decoder of the corresponding stream and controllingthe reproducing operation of the DVD-audio. However, when the bit streamand/or the sub-picture stream are in the state where the extended audiodata is not recorded, the system controller 402 judges that the analyzedinformation is the DVD-video, thereby disabling the sub-picture decoderand the video decoder and terminating the reproducing operation of theDVD-audio.

A mechanism & pick-up unit 404 reads the data recorded at the DVD-audiodisc and the DVD-audio disc. A servo & RF/ECC unit 406 analyzes andcorrects the error of the audio data output from the mechanism & pick-upunit 404. The servo & RF/ECC unit 406 includes an error correctioncircuit (hereinafter, referred to as ECC). A servo controller forperforming all kinds of servo functions by controlling the mechanism &pick-up unit 404 under the control of the system controller 402 isomitted in FIG. 18.

A system parser 408 separates the sub-picture stream, the video streamand the audio stream from the DVD data streams output from the servo &RF/ECC unit 406 under the control of the system controller 402 andoutputs the separated stream.

A sub-picture decoder 410 receives the sub-picture stream output fromthe system parser 408. The sub-picture decoder 410 is not driven whenthe data of the sub-picture stream is the extended audio data under thecontrol of the system controller 402 and is driven when the data of thesub-picture stream is the sub-picture data, thereby decoding-outputtingthe sub-picture data. A video decoder 412 receives the video streamoutput from the system parser 408. The video decoder 412 is not drivenwhen the data of the video stream is the extended audio data under thecontrol of the system controller 402 and is driven when the data of thevideo stream is the video data, thereby decoding-outputting the videodata.

An audio decoder 414 includes a basic audio decoder and an extendedaudio decoder. The audio decoder 414 receives the sub-picture stream,the video stream, and the audio stream output from the system parser408, decodes the basic audio data and the extended audio data byenabling corresponding decoders under the control of the systemcontroller 402, combines the decoded audio data and the extended audiodata, and outputs the digital audio data.

A video outputter 416 inputs the sub-picture data output from thesub-picture decoder 410 and the video data output from the video decoder412 and converts the input data in conformity with the format of adisplay unit (not shown) to be output. An audio outputter 418 convertsthe input data into the digital audio data and the analog audio signalaccording to the characteristic of the device for reproducing the datawith input of the decoded audio data output from the audio decoder 414and outputs the converted data.

The device of FIG. 18 can be commonly used with both the DVD-audio andthe DVD-video. As a consequence, the disc reproducing device having theconstruction of FIG. 18 can be commonly used as the DVD-audio of usingthe video/sub-picture stream as the extended audio stream, the DVD-audioof using the video stream as the extended audio stream and usingintactly the sub-picture stream, the DVD₋₋ audio of intactly using thevideo stream and using the sub-picture stream as the extended audiostreams, and the DVD-video of using the video and sub-picture streams asoriginal video and sub-pictures.

The audio decoder 414 further includes the basic audio decoder and theextended audio decoder so as to decode the basic audio data and theextended audio data according to an embodiment of the present invention,as illustrated in FIG. 19. FIG. 19 shows the structure of the combinedvideo/audio decoder in the reproducing device having the same structureas that of FIG. 18.

With reference to FIG. 19, an input data buffer 454 inputs thesub-picture stream data, the video stream data, and the audio streamdata output from the system parser 408, outputs the sub-picture streamdata and the video stream data as the extended audio stream, and storesthe audio stream data as the basic audio stream.

A basic audio decoder 456 includes the decoders corresponding to thecoding modes of the audio data recorded in the audio stream of theDVD-audio. The basic audio decoder 456 includes an AC-3 decoder, MPEG-1decoder, MPEG-2 decoder, LPCM decoder, DTS decoder(option), and SDDSdecoder(option) depending on the audio decoding modes of the DVD-video.The basic audio decoder 456 inputs the audio stream of the basic audioarea output from the input data buffer 454, and decoding-outputs thebasic audio data input by driving the decoder corresponding to the audiocoding mode of the basic audio stream by the control of the decodingcontroller 452.

An extended audio decoder 458 includes the decoders corresponding to thecoding modes of the audio data recorded at the extended audio stream ofthe DVD-audio. The extended audio decoder 458 can further have apseudo-lossless psychoacoustic coding decoder, a bit stream decoder anda lossless coding decoder regardless of the LPCM decoder. The extendedaudio decoder 458 inputs the audio stream of the extended audio areaoutput from the input data buffer 454 and decoding-outputs the extendedaudio data input by driving the decoder corresponding to the audiocoding mode of the extended audio stream under the control of thedecoding controller 452.

The extender 460 analyzes the usage value positioned in thecorresponding channel header of the extended audio data output from theextended audio decoder 458 and the basic audio data output from thebasic audio decoder 456 and performs the function such as the bitextension, the bandwidth extension, and the channel extension. Accordingto the embodiment of the present invention, the bit extension method isperformed by combining the data of the basic audio area and the data ofthe extended audio area as shown in FIG. 11 and extending the number ofthe bits. The bandwidth extension method is performed byfrequency-converting the data of the basic audio area, combining thefrequency-converted data with the high-pass audio data of the extendedaudio area and extending the bandwidth as shown in FIG. 12A, or withcombining the data of the basic audio area having the 2 bands expressionsystem with the audio data of the extended audio area and extending thebandwidth as shown in FIG. 12B. The channel extension method isperformed to cross-correlation process the channel of the basic audiodata and the channel of the extended audio data, thereby removing thesignal of the channel of the extended audio data combined with the basicaudio data as shown in FIG. 13A, or intactly reproducing the channel ofthe basic audio data as the channel of the extended audio data as shownin FIG. 13B. In this case, the extender 460 becomes abit/bandwidth/channel extender, which inputs the basic audio data of thebasic channel output from the basic audio decoder 456 and the extendedaudio data of the basic channel output from the extended audio decoder458 and combines the two types of audio data, so that the output audiodata can be output after the bit extension and/or the bandwidthextension.

An output data buffer 462 inputs and stores the audio data output fromthe extender 460.

The decoding controller 452 generates control signals for controllingoperations for all of the components of the audio decoder 414 under thecontrol of the system controller 402.

FIG. 20 is a flow chart illustrating the process of initializing thecombined audio decoder for reproducing the title in the combinedreproducing device as shown in FIG. 18. In regard of FIG. 20, in thereproducing mode, the system controller 402 drives the mechanism &pickup unit 404 and reads the VTSI information of the title to bereproduced in the data read from the disc in step 511. After that, instep 513, the system controller 402 analyzes the attribute informationof the video stream after reading b15-b14 of VTS₋₋ V₋₋ ATR of VTSI₋₋MAT. At this point, the VTS₋₋ V₋₋ ATR has the construction equal of thatof FIG. 6A, and the value of b15-b14 becomes the video compression modeinformation. In this event, when the value of b15-b14 is "11", it ischecked that the extended audio mode exists. But, when the value thereofis "00" or "01", it is checked that the video mode exists. Also, whenthe value thereof is "10", it is checked that the video mode and theextended audio mode do not exist. Therefore, when checked in the abovestep 513 that the value of b15-b14 of VTS₋₋ V₋₋ ATR is "11", the systemcontroller 402 proceeds to step 519, thereby controlling the systemparser 408 and the audio decoder 414 to enable the audio decoding of thevideo stream and to disable the video decoder 412. However, when checkedin the above step 513 that the value of b15-14 of VTS₋₋ V₋₋ ATR is "00"or "01", the system controller 402 proceeds to step 517, therebyenabling the video decoder 412 and disabling the audio decoding of thevideo stream. Also, when checked in the above step 513 that the value ofb15-14 of VTS₋₋ V₋₋ ATR is "10", the system controller 402 proceeds tostep 515, thereby controlling the system parser 408 and the audiodecoder 414 to disable the audio decoding of the video stream and thevideo decoder 412.

After performing the foregoing step 515, 517, or 519, in step 521, thesystem controller 402 analyzes the attribute information of thesub-picture stream by reading b47-b45 of VTS₋₋ SPST₋₋ ATR of the VTSI₋₋MAT. In this instance, VTS₋₋ SPST₋₋ ATR has the construction equal tothat of FIG. 6B, and the value of b47-b45 becomes the sub-picture codingmode information. In this event, when the value of b47-b45 is "111", itis checked that the extended audio mode exists. But, when the valuethereof is "000", it is checked that the sub-picture mode exists. Also,when b47-b45 has other values except for "000" and "111", it is checkedthat the reserved state exists. Therefore, when checked in the abovestep 521 that the value of b47-b45 of VTS₋₋ SPST₋₋ ATR is "000", thesystem controller 402 proceeds to step 525, thereby controlling thesystem parser 408 and the audio decoder 414 to enable the sub-picturedecoder 410 and to disable the audio decoding of the sub-picture stream.In this case, the sub-picture data can be the audio title information ofthe title reproduced. Also, when checked in the above step 521 that thevalue of b47-b45 of VTS₋₋ SPST₋₋ ATR is "111", the system controller 402proceeds to step 527, thereby enabling the audio decoding of thesub-picture stream and disabling the sub-picture decoder 410. Also, whenchecked in the above step 521 that b47-45 of VTS₋₋ SPST₋₋ ATR hasanother value except for "111" and "000", the system controller 402proceeds to step 523, thereby controlling the system parser 408 and theaudio decoder 414 to disable the audio decoding of the sub-picturestream and sub-picture decoder 410.

The system controller 402 checks the coding mode of the sub-picturestream and the coding mode of the video stream for the VTSI informationreproduced in the disc, analyzes whether or not the data of thecorresponding stream is the extended audio data, and controls theextended audio decoder 458 of the audio decoder 414 to be driven in caseof the stream of the extended audio mode.

As stated hereinafter, in the reproducing mode of the DVD-audio that theextended audio data is recorded, the system controller 402 drives theaudio decoder 414. Thus, the audio decoder 414 performs steps of FIGS.17A through 17C to decode and extend the audio data.

The device for commonly reproducing the DVD-audio and the DVD-videoaccording to the embodiment of the present invention includes thesub-picture 410, the video decoder 412, the basic audio decoder 456, theextended audio decoder 458, and the extender 460, which analyzes theVTSI information of the reproduced title, checks theexistence/nonexistence of the extended audio data, and decoding-outputsthe data of each corresponding stream according the checking results.

Consequently, the device for commonly reproducing the DVD-audio and theDVD-video can perform four functions as below.

In case that the video stream and the sub-picture stream are theextended audio stream, the system controller 402 controls the systemparser 408, the decoders 410, 412, and 414, and performs the reproducingmode of the DVD-audio. In this case, the system parser 408 transmits thevideo stream to the video decoder 412 and transmits the sub-picturestream to the sub-picture decoder 410. As well, the system parser 408transmits the data of the video stream and the sub-picture stream withthe audio stream to the audio decoder 414. Here, as shown in FIG. 20,the sub-picture decoder 410 and the video decoder 412 are disabled andthe extended audio decoder 458 of the audio decoder 414 is disabled.Thus, the video stream and the sub-picture stream having the extendedaudio data are applied to the extended audio decoder 458 of the audiodecoder 414, the audio stream is applied to the basic audio decoder 456of the audio decoder 414, and the extender 460 combines the decodedbasic audio data and the extended audio data with each other, therebyextending the bits, the bandwidth, and the channel.

In case that the video stream is the extended audio stream and thesub-picture stream is not the extended audio stream, the systemcontroller 402 controls the system parser 408, the decoders 410, 412,and 414, and performs the reproducing mode of the DVD-audio. At thiscase, the system parser 408 transmits the video stream to the videodecoder 412 and transmits the sub-picture stream to the sub-picturedecoder 410. As well, the system parser 408 transmits the video streamwith the audio stream to the audio decoder 414. Here, as shown in FIG.20, the sub-picture decoder 410 is enabled, the video decoder 412 isdisabled and the extended audio decoder 458 of the audio decoder 414 isdisabled. Thus, when the video stream having the extended audio data isapplied to the extended audio decoder 458 of the audio decoder 414, theaudio stream is applied to the basic audio decoder 456 of the audiodecoder 414 and the sub-picture stream is applied to the sub-picturedecoder 410. In this case, the sub-picture decoder 410 decodes the dataof the sub-picture stream and outputs the language information of thereproduced audio, and the extender 460 combines the decoded basic audiodata and the extended audio data with each other, thereby extending thebits, the bandwidth, and the channel.

In case that the video stream is an original video stream and thesub-picture stream is the extended audio stream, the system controller402 controls the system parser 408, the decoders 410, 412, and 414, andperforms the reproducing mode of the DVD-audio. At this case, the systemparser 408 transmits the video stream to the video decoder 412 andtransmits the sub-picture stream to the sub-picture decoder 410. Aswell, the system parser 408 transmits the sub-picture stream with theaudio stream to the audio decoder 414. Here, as shown in FIG. 20, thesub-picture decoder 410 is disabled, the video decoder 412 is enabledand the extended audio decoder 458 of the audio decoder 414 is enabled.Thus, when the sub-picture stream having the extended audio data isapplied to the extended audio decoder 458 of the audio decoder 414, theaudio stream is applied to the basic audio decoder 456 of the audiodecoder 414 and the video stream is applied to the video decoder 412. Inthis case, the video decoder 412 decodes the data of the video streamand outputs the picture information of the reproduced audio, and theextender 460 combines the decoded basic audio data and the extendedaudio data with each other, thereby extending the bits, the bandwidth,and the channel.

In case that the video stream and the sub-picture stream are not theextended audio stream, the system controller 402 controls the systemparser 408, the decoders 410, 412, and 414, and performs the reproducingmode of the DVD-audio. In this case, the system parser 408 transmits thevideo stream to the video decoder 412, transmits the sub-picture streamto the sub-picture decoder 410, and transmits the audio stream to theaudio decoder 414. Also, as shown in FIG. 20, the sub-picture decoder410 and the video decoder 412 are enabled and the extended audio decoder458 of the audio decoder 414 is disabled. Thus, the video stream isapplied to the video decoder 412 to be decoded as the picture data andthe sub-picture stream is applied to the sub-picture decoder 410 to bereproduced as the language information of the reproduced video andaudio. In this case, now that the extended audio decoder 458 thereof isnot operated, the basic audio decoder 456 reproduces the audio datarecorded in the basic audio area.

As apparent from the foregoing, the DVD-audio according to theembodiment of the present invention selectively uses the video streamand the sub-picture stream of the DVD video and records the extendedaudio data, thereby improving the sound quality of the audio data. Thatis, because of performing the bit extension, the bandwidth extension,and the channel extension by combining the basic audio data with theextended audio data of the DVD-video, the DVD-audio can enhance thequality of the reproduced audio. Likewise, since the DVD-audio recordsthe extended audio data in correspondence with the standard of theDVD-video, the DVD-audio can be replaced with the DVD-video reproducingdevice. In the device for commonly reproducing the DVD-audio and theDVD-video capable of being used in the video disc and the chip set ofthe DVD-video reproducing device, it is advantageous in that the highsound quality of the audio can be reproduced by installing a new decoderwhile being reciprocally used with the DVD-video reproducing device.

Therefore, it should be understood that the present invention is notlimited to the particular embodiment disclosed herein as the best modecontemplated for carrying out the present invention, but rather that thepresent invention is not limited to the specific embodiments describedin this specification except as defined in the appended claims.

What is claimed is:
 1. A device for reproducing a DVD audio disc whichhas a video title set having a video attribute including an extendedaudio data mode indicator, a sub-picture attribute including saidextended audio data mode indicator, basic audio packs for storing basicaudio data, video/sub-picture packs including an extended audio stream,said extended audio stream comprising an extended audio stream headerand frames, said extended audio stream header comprising a usage areafor storing an audio coding mode indicator, a sampling frequency, aquantization bit number, and usage data of extended audio data, and saidusage area of said extended audio data indicating bit extension,bandwidth extension, and channel extension of said extended audio data,wherein said video/sub-picture packs are formed as extended audio packsfor selectively recording the extended audio data on the DVD audio disc,and said extended audio packs are combinable with said basic audio packsto be reproduced as audio data, said device comprising:a basic audiodecoder; an extended audio decoder; and an extender; wherein said basicaudio decoder reproduces said basic audio data of said basic audio pack,said extended audio decoder reproduces said extended audio data and saidextender combines said extended audio data with said basic audio data,performing bit extension, bandwidth extension, and channel extension ofsaid combined basic audio data and extended audio data, to generateoutput audio data.
 2. The device as defined in claim 1, wherein saidextender comprises:a bit extender to arrange said basic audio data at anupper bit and said extended audio data at a lower bit, to extend a bitnumber of said output audio data; a bandwidth extender to oversamplesaid basic audio data, making the oversampled data equal to saidsampling frequency of said extended audio data and adding saidoversampled basic audio data to said extended audio data, to extend abandwidth of said output audio data; and a channel extender for intactlyoutputting channels of said basic audio data and channels of saidextended audio data, to extend a number of the channels of said outputaudio data.
 3. The device as defined in claim 1, wherein said extenderis comprised of:a bit extender to arrange said basic audio data at anupper bit and said extended audio data at a lower bit, to extend a bitnumber of said output audio data; a bandwidth extender having a perfectreconstruction FIR filter to combine 2-bands audio data with saidextended audio data of a same sampling frequency of frequency-convertedhigh-pass with said basic audio data having a smaller samplingfrequency, to extend a bandwidth of said output audio data; and achannel extender for intactly outputting channels of said basic audiodata and channels of said extended audio data, to extend a number of thechannels of said output audio data.
 4. The device as defined in claim 1,wherein said extender comprises:a bit extender to arrange said basicaudio data at an upper bit and said extended audio data at a lower bit,to extend a bit number of said output audio data; a bandwidth extenderto oversample said basic audio data, making the oversampled data equalto said sampling frequency of said extended audio data and adding saidoversampled basic audio data to said extended audio data, to extend abandwidth of said output audio data; and a channel extender having across-correlation processor to combine channels of said basic audio dataand channels of said extended audio data and removing a signal of saidextended audio channels included in said basic audio data, therebyextending a channel number of said output audio data.
 5. The device asdefined in claim 1, wherein said extender comprises:a bit extender toarrange said basic audio data at an upper bit and said extended audiodata at a lower bit, to extend a bit number of said output audio data; abandwidth extender having a perfect reconstruction FIR filter to combine2-bands audio data with said extended audio data of a same samplingfrequency of frequency-converted high-pass with said basic audio datahaving a smaller sampling frequency, to extend a bandwidth of saidoutput audio data; and a channel extender having a cross-correlationprocessor to combine channels of the basic audio data and channels ofsaid extended audio data and removing a signal of said extended audiochannels included in said basic audio data, thereby extending a channelnumber of said output audio data.
 6. A device for commonly reproducing aDVD audio disc and a DVD video disc, wherein the DVD audio disc has avideo title set having a video attribute including an extended audiodata mode indicator, a sub-picture attribute including said extendedaudio data mode indicator, basic audio packs for storing basic audiodata, video/sub-picture packs including an extended audio stream, saidextended audio stream comprising an extended audio stream header andframes, said extended audio stream header comprising a usage area forstoring an audio coding mode indicator, a sampling frequency,quantization bit number, and usage data of extended audio data, and saidusage area of said extended audio data indicating bit extension,bandwidth extension, and channel extension of said extended audio data,wherein said video/sub-picture packs are formed as extended audio packsfor selectively recording the extended audio data on the DVD audio disc,wherein said extended audio packs are combinable with said basic audiopacks to be reproduced as audio data, and the DVD video disc has thebasic audio packs, video packs, and sub-picture packs, said devicecomprising:a controller; a video decoder; a sub-picture decoder; a basicaudio decoder; an extended audio decoder; and an extender; wherein whensaid device is in a DVD audio disc reproducing mode, said controllerdisables said video decoder and said sub-picture decoder, said basicaudio decoder reproduces data of said basic audio pack, said extendedaudio decoder reproduces said extended audio data, and said extendercombines said extended audio data with said basic audio data, to performbit extension, bandwidth extension, and channel extension of saidcombined audio data and extended audio data, to generate output audiodata; and wherein when said device is in a DVD video disc reproducingmode, said controller disables said extended audio decoder and saidextender, said basic audio decoder reproduces data of said basic audiopack, said video decoder reproduces said video pack, and saidsub-picture decoder reproduces said sub-picture pack.
 7. The device asdefined in claim 6, wherein said extender comprises:a bit extender toarrange said basic audio data at an upper bit and said extended audiodata at a lower bit, to extend a bit number of said output audio data; abandwidth extender to oversample said basic audio data, making theoversampled data equal to said sampling frequency of said extended audiodata and adding said oversampled basic audio data to said extended audiodata, to extend a bandwidth of said output audio data; and a channelextender for intactly outputting channels of said basic audio data andchannels of said extended audio data, to extend a number of the channelsof said output audio data.
 8. The device as defined in claim 6, whereinsaid extender comprises:a bit extender to arrange said basic audio dataat an upper bit and said extended audio data at a lower bit, to extend abit number of said output audio data; a bandwidth extender having aperfect reconstruction FIR filter to combine 2-bands audio data withsaid extended audio data of a same sampling frequency offrequency-converted high-pass with said basic audio data having asmaller sampling frequency, to extend a bandwidth of said output audiodata; and a channel extender for intactly outputting channels of saidbasic audio data and channels of said extended audio data, to extend anumber of the channels of said output audio data.
 9. The device asdefined in claim 6, wherein said extender comprises:a bit extender toarrange said basic audio data at an upper bit and said extended audiodata at a lower bit, to extend a bit number of said output audio data; abandwidth extender to oversample said basic audio data, making theoversampled data equal to said sampling frequency of said extended audiodata and adding said oversampled basic audio data to said extended audiodata, to extend a bandwidth of said output audio data; and a channelextender having a cross-correlation processor to combine channels ofsaid basic audio data and channels of said extended audio data andremoving a signal of said extended audio channels included in said basicaudio data, thereby extending a channel number of said output audiodata.
 10. The device as defined in claim 6, wherein said extendercomprises:a bit extender to arrange said basic audio data at an upperbit and said extended audio data at a lower bit, to extend a bit numberof said output audio data; a bandwidth extender having a perfectreconstruction FIR filter to combine 2-bands audio data with saidextended audio data of a same sampling frequency of frequency-convertedhigh-pass with said basic audio data having a smaller samplingfrequency, to extend a bandwidth of said output audio data; and achannel extender having a cross-correlation processor to combinechannels of the basic audio data and channels of said extended audiodata and removing a signal of said extended audio channels included insaid basic audio data, thereby extending a channel number of said outputaudio data.
 11. A method for reproducing data from a DVD audio discwhich records basic audio data in an audio data recording area andextended audio data at video and sub-picture data recording areas inaccordance with a DVD video standard for recording video data,sub-picture data, and audio data at each of a plurality of video titleset areas, the method comprising the steps of:(a) analyzing video andsub-picture attributes of the video title set to be reproduced; (b)enabling a basic audio decoder to decode said basic audio data and anextended audio decoder to decode said extended audio data in an extendedaudio mode; (c) checking usage of the extended audio data included inchannel headers of the corresponding video title set; and (d) combiningthe extended audio data decoded by said extended audio decoder with saidbasic audio data decoded by said basic audio decoder, to generate outputaudio data.
 12. The method as defined in claim 11, wherein said step (d)comprises the steps of:arranging said basic audio data at an upper bitand said extended audio data at a lower bit, to extend a number of bitsof said output audio data; combining said basic audio data with saidextended audio data, to extend a bandwidth of said output audio data;and combining a channel of said extended audio data with a channel ofsaid basic audio data, to extend the number of bits.
 13. A method forreproducing data from a DVD audio disc which records basic audio data inan audio data recording area, extended audio data in a video picturedata recording area and sub-picture data in a sub-picture data recordingarea in accordance with a DVD video standard for recording video data,the sub-picture data, and the audio data in each of a plurality of videotitle set areas, the method comprising the steps of:(a) analyzing avideo attribute of the video title set to be reproduced; (b) enabling asub-picture decoder to decode said sub-picture data, a basic audiodecoder to decode said basic audio data and an extended audio decoder todecode said extended audio data in an extended audio mode; (c) checkingusage of said extended audio data included in channel headers of thecorresponding video title set; (d) combining said extended audio datadecoded by said extended audio decoder with said basic audio datadecoded by said basic audio decoder; and (e) outputting said sub-picturedata output from said sub-picture decoder as language information ofreproduced audio.
 14. The method as defined in claim 13, wherein saidstep (d) comprises the steps of:arranging said basic audio data at anupper bit and said extended audio data at a lower bit, to extend anumber of bits of said output audio data; combining said basic audiodata with said extended audio data, to extend a bandwidth of said outputaudio data; and combining a channel of said extended audio data with achannel of said basic audio data, to extend the number of bits.
 15. Amethod for reproducing data from a DVD audio disc which records basicaudio data in an audio data recording area, extended audio data in asub-picture data recording area and video data in a video data recordingarea in accordance with a DVD video standard for recording the videodata, sub-picture data, and the audio data in each of a plurality ofvideo title set areas, comprising the steps of:(a) analyzing sub-pictureattributes of the video title set to be reproduced; (b) enabling a videodecoder to decode said video data, a basic audio decoder to decode saidbasic audio data and an extended audio decoder to decode said extendedaudio data in an extended audio mode; (c) checking usage of saidextended audio data included in channel headers of the correspondingvideo title set; (d) combining said extended audio data decoded by saidextended audio decoder with said basic audio data decoded by said basicaudio decoder; and (e) outputting the video data output from said videodecoder as picture information of reproduced audio.
 16. The method asdefined in claim 15, wherein said step (d) comprises the stepsof:arranging said basic audio data at an upper bit and said extendedaudio data at a lower bit, to extend a number of bits of said outputaudio data; combining said basic audio data with said extended audiodata, to extend a bandwidth of said output audio data; and combining achannel of said extended audio data with a channel of said basic audiodata, to extend the number of bits.
 17. A digital versatile disc (DVD),comprising:an audio data recording area arranged in accordance with aDVD video standard; a video data recording area arranged in accordancewith said DVD video standard; and a sub-picture data recording areaarranged in accordance with said DVD video standard; wherein said audiodata recording area stores basic audio data, and at least one of saidvideo data recording area and said sub-picture recording area storesextended audio data, said extended audio data to be combined with saidbasic audio data upon reproduction to produce output audio data.
 18. TheDVD as claimed in claim 17, wherein if said video data recording areastores said extended audio data, then said sub-picture data recordingarea stores sub-picture data.
 19. The DVD as claimed in claim 18,wherein said sub-picture data is language information of reproducedvideo data.
 20. The DVD as claimed in claim 17, wherein if saidsub-picture data recording area stores said extended audio data, thensaid video data recording area stores video data.
 21. The DVD as claimedin claim 20, wherein said video data is picture information ofreproduced audio data.
 22. The DVD as claimed in claim 17, wherein theone of said video data recording area and said sub-picture datarecording area which stores said extended audio data further stores anextended audio stream header and frames, said extended audio streamheader comprising a usage area for storing an audio coding modeindicator, a sampling frequency, a quantization bit number, and usagedata of said extended audio data, and said usage area of said extendedaudio data indicating bit extension, bandwidth extension, and channelextension of said extended audio data.
 23. A reproducing device forreproducing data from a digital versatile disc (DVD) including an audiodata recording area arranged in accordance with a DVD video standard, avideo data recording area arranged in accordance with said DVD videostandard, and a sub-picture data recording area arranged in accordancewith said DVD video standard, wherein said audio data recording areastores basic audio data, and one of said video data recording area andsaid sub-picture recording area stores extended audio data, thereproducing device comprising:a basic audio decoder to decode said basicaudio data; an extended audio decoder to decode said extended audiodata; and an extender to combine said decoded extended audio data withsaid decoded basic audio data, and performing bit extension, bandwidthextension, and channel extension of said combined basic audio data andextended audio data, to generate output audio data.
 24. A method forreproducing data from a DVD audio disc which records basic audio data inan audio data recording area, extended audio data in a video picturedata recording area and a sub-picture data recording area in accordancewith a DVD video standard for recording video data, sub-picture data,and the audio data in each of a plurality of video title set areas, themethod comprising the steps of:(a) analyzing attributes of the videotitle set to be reproduced; (b) decoding said basic audio data anddecoding said extended audio data in an extended audio mode bysynchronizing said extended audio data stored in said video picture datarecording area with said extended audio data stored in said sub-picturedata recording area using PTS which indicates presentation time stamp;(c) checking usage of said extended audio data included in channelheaders of the corresponding video title set; and (d) combining saiddecoded extended audio data with said decoded basic audio data.